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Is it possible to extend or modify the code of a C# class at runtime?
My question specifically revolves around Monkey Patching / Duck Punching or Meta Object Programming (MOP), as it happens in scripting languages such as Groovy, Ruby etc.
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Monkey patching is a technique used to dynamically update the behavior of a piece of code at run-time. A monkey patch (also spelled monkey-patch, MonkeyPatch) is a way to extend or modify the runtime code of dynamic languages (e.g. Smalltalk, JavaScript, Objective-C, Ruby, Perl, Python, Groovy, etc.)
In Python, the term monkey patch refers to dynamic (or run-time) modifications of a class or module. In Python, we can actually change the behavior of code at run-time. We use above module (monk) in below code and change behavior of func() at run-time by assigning different value.
Monkey patching is reopening the existing classes or methods in class at runtime and changing the behavior, which should be used cautiously, or you should use it only when you really need to. As Python is a dynamic programming language, Classes are mutable so you can reopen them and modify or even replace them.
The primary purpose of this module is to carefully patch, in place, portions of the standard library with gevent-friendly functions that behave in the same way as the original (at least as closely as possible). The primary interface to this is the patch_all() function, which performs all the available patches.
Is it possible to extend or modify the code of a C# class at run-time?
No it is not possible to do this in .NET. You could write derived classes and override methods (if they are virtual) but you cannot modify an existing class. Just imagine if what you were asking was possible: you could modify the behavior of some existing system classes like System.String.
You may also take a look at Extension methods to add functionality to an existing class.
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